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JP2008208871A - Rocker arm bearing manufacturing method - Google Patents

Rocker arm bearing manufacturing method Download PDF

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Publication number
JP2008208871A
JP2008208871A JP2007044342A JP2007044342A JP2008208871A JP 2008208871 A JP2008208871 A JP 2008208871A JP 2007044342 A JP2007044342 A JP 2007044342A JP 2007044342 A JP2007044342 A JP 2007044342A JP 2008208871 A JP2008208871 A JP 2008208871A
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Japan
Prior art keywords
rocker arm
shaft
arm bearing
support shaft
shaft end
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Pending
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JP2007044342A
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Japanese (ja)
Inventor
Nariaki Sakaki
斉亮 榊
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JTEKT Corp
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JTEKT Corp
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Priority to JP2007044342A priority Critical patent/JP2008208871A/en
Priority to US12/071,491 priority patent/US7678206B2/en
Priority to EP08003191A priority patent/EP1961925B1/en
Publication of JP2008208871A publication Critical patent/JP2008208871A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Rolling Contact Bearings (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a bearing for a rocker arm capable of simplifying a quenching process. <P>SOLUTION: Hardening heat treatment is applied to a whole rocker arm bearing assembly formed by caulking and fixing shaft end parts 14a of a supporting shaft 14 to inner peripheral edges of shaft end insertion holes 12a of a pair of opposite sidewalls 12 as fixing means and by rotatably supporting an outer ring 18 on a raceway part of a shaft intermediate part 14b of the supporting shaft 14 through a plurality of needle rollers 16 serving as rolling elements to manufacture the bearing for the rocker arm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、自動車等のエンジンの動弁機構に付設されるバルブを開閉動作するロッカーアームに組み込まれるロッカーアーム用軸受の製造方法に関する。   The present invention relates to a method of manufacturing a rocker arm bearing incorporated in a rocker arm that opens and closes a valve attached to a valve operating mechanism of an engine such as an automobile.

ロッカーアームは、自動車エンジンの動弁機構に付設されて、動弁カムの回転に伴いその胴体がラッシュアジャスタ受け（ピボット受け）またはロッカーアームシャフトを中心に揺動して自動車エンジンのバルブを開閉動作させるものである。
このようなロッカーアームに組み込まれる従来のロッカーアーム用軸受は、軸受保持部材としてロッカーアーム胴体を構成する一対の対向側壁と、一対の対向側壁の軸端挿通孔の内周縁に軸端部の端面がかしめられる支持軸と、該支持軸の軸中間部の軌道部に、複数のころを介して又は直接、回転自在に支持される外輪とを備えて構成されている。
そして、支持軸の軸中間部の軌道部外表面が高周波焼入れにより表面硬化されており、両軸端部は熱処理無しとして端面かしめが可能な表面硬度とされて対向側壁の軸端挿通孔の内周縁にかしめ付けられて固定されている（例えば、特許文献１参照）。
特開２００４−１５６６８８号公報（第２頁、第１１図） The rocker arm is attached to the valve mechanism of the automobile engine. As the valve cam rotates, the body swings around the lash adjuster receiver (pivot receiver) or the rocker arm shaft to open and close the valve of the automobile engine. It is something to be made.
A conventional rocker arm bearing incorporated in such a rocker arm has a pair of opposed side walls constituting a rocker arm body as a bearing holding member, and an end face of a shaft end portion on an inner peripheral edge of a shaft end insertion hole of the pair of opposed side walls. The support shaft is caulked, and the outer ring is rotatably supported on the raceway portion of the shaft intermediate portion of the support shaft via a plurality of rollers or directly.
The outer surface of the track part of the shaft intermediate part of the support shaft is hardened by induction hardening, and both shaft end parts have a surface hardness that allows end face caulking without heat treatment. It is fixed by caulking to the periphery (see, for example, Patent Document 1).
JP 2004-156688 A (2nd page, FIG. 11)

従来のロッカーアーム用軸受は、一対の対向側壁の軸端挿通孔に支持軸が挿入され、その支持軸の挿入後に軸端挿通孔の内周縁に支持軸の軸端部の端面がかしめ固定されものであり、軸受の機能上、支持軸のころ転走部である軸中央部付近は焼き入れ熱処理が予め実施されている必要があるが、支持軸の軸両端部はかしめを施すために熱処理が実施されないようにしなければならず、このような支持軸の熱処理には普通焼き入れを行うことができず、高周波誘導加熱コイルを用いた部分的な高周波焼き入れに限定され、手間がかかるという問題があった。
本発明はかかる問題点を解決するためになされたもので、焼き入れ工程の簡素化が可能なロッカーアーム用軸受の製造方法を得ること目的とするものである。 In a conventional rocker arm bearing, a support shaft is inserted into the shaft end insertion holes of a pair of opposing side walls, and the end surface of the shaft end of the support shaft is caulked and fixed to the inner peripheral edge of the shaft end insertion hole after the support shaft is inserted. For bearing function, quenching heat treatment needs to be performed in advance near the center of the shaft, which is the roller rolling part of the support shaft, but both ends of the shaft of the support shaft are heat treated for caulking. However, the heat treatment of the support shaft cannot be normally quenched, and is limited to partial induction hardening using a high frequency induction heating coil. There was a problem.
The present invention has been made to solve such a problem, and an object of the present invention is to obtain a method of manufacturing a rocker arm bearing capable of simplifying the quenching process.

本発明に係るロッカーアーム用軸受の製造方法は、一対の対向側壁の軸端挿通孔の内周縁に軸端部が固定される支持軸と、該支持軸の軸中間部の軌道部に、複数の転動体を介して又は直接、回転自在に支持される外輪とを備えたロッカーアーム用軸受の製造方法であって、
前記一対の対向側壁の軸端挿通孔の内周縁に前記支持軸の軸端部を固定手段で固定し、該支持軸の軸中間部の軌道部に、複数の転動体を介して又は直接、外輪を回転自在に支持させて形成したロッカーアーム用軸受組立体の全体に、硬化熱処理を実施してロッカーアーム用軸受を製造するようにしたものである。
また、前記固定手段はかしめ又は溶接によるものである。
さらに、前記ロッカーアーム用軸受組立体に対する硬化熱処理は真空又は不活性ガスの雰囲気下で実施される焼入れ熱処理である。 The method for manufacturing a rocker arm bearing according to the present invention includes a support shaft having a shaft end portion fixed to the inner peripheral edge of the shaft end insertion hole of the pair of opposed side walls, and a plurality of track portions at a shaft intermediate portion of the support shaft. A method for manufacturing a rocker arm bearing comprising an outer ring supported rotatably through a rolling element of
The shaft end portion of the support shaft is fixed to the inner peripheral edge of the shaft end insertion hole of the pair of opposite side walls by a fixing means, and the track portion of the shaft intermediate portion of the support shaft is directly or directly via a plurality of rolling elements. A rocker arm bearing is manufactured by subjecting the entire rocker arm bearing assembly formed by rotatably supporting an outer ring to a curing heat treatment.
The fixing means is caulking or welding.
Further, the hardening heat treatment for the rocker arm bearing assembly is a quenching heat treatment performed in a vacuum or an inert gas atmosphere.

本発明によれば、一対の対向側壁の軸端挿通孔の内周縁に前記支持軸の軸端部を固定手段で固定し、該支持軸の軸中間部の軌道部に、複数の転動体を介して又は直接、外輪を回転自在に支持させて形成したロッカーアーム用軸受組立体の全体に、硬化熱処理を実施してロッカーアーム用軸受を製造するようにしたので、従来のように複雑で手間のかかる高周波焼き入れを行わなくても済み、焼き入れ工程を簡素化でき、効率よくロッカーアーム用軸受を組み立てることができる。
また、固定手段はかしめ又は溶接によるものであり、簡単に固定することができる。
さらに、前記ロッカーアーム用軸受組立体に対する焼き入れ熱処理は真空又は不活性ガスの雰囲気下で実施される焼入れ熱処理であることにより、スケール等の付着が少なくなる。 According to the present invention, the shaft end portion of the support shaft is fixed to the inner peripheral edge of the shaft end insertion hole of the pair of opposing side walls by the fixing means, and a plurality of rolling elements are disposed on the track portion of the shaft intermediate portion of the support shaft. The rocker arm bearing assembly, which is formed by directly or directly supporting the outer ring through a curing process, is hardened and heat-treated to produce the rocker arm bearing. Such induction hardening is not required, the quenching process can be simplified, and the rocker arm bearing can be assembled efficiently.
The fixing means is caulking or welding, and can be fixed easily.
Furthermore, the quenching heat treatment for the rocker arm bearing assembly is a quenching heat treatment performed in a vacuum or an inert gas atmosphere, so that adhesion of scales and the like is reduced.

実施の形態１．
図１は本発明の実施の形態１に係るロッカーアーム用軸受を備えたエンドピボットタイプのロッカーアームの側面図、図２は図１のＡ−Ａ線に沿う断面図である。
図において、ロッカーアームに組み込まれる本発明の実施の形態に係るロッカーアーム用軸受は、軸受保持部材としてロッカーアーム胴体を構成する一対の対向側壁１２と、一対の対向側壁１２の軸端挿通孔１２ａに挿入されて固定される支持軸１４と、支持軸１４の軸中間部の軌道部に、複数のころ１６を介して回転自在に支持される外輪１８とを備えて構成されている。その外輪１８の外周面にはカム２０が当接してロッカーアームが構成される。 Embodiment 1 FIG.
1 is a side view of an end pivot type rocker arm provided with a rocker arm bearing according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
In the figure, a rocker arm bearing according to an embodiment of the present invention incorporated in a rocker arm includes a pair of opposed side walls 12 constituting a rocker arm body as a bearing holding member, and shaft end insertion holes 12a of the pair of opposed side walls 12. The support shaft 14 is inserted into and fixed to the support shaft 14, and the outer ring 18 is rotatably supported on the raceway portion of the shaft intermediate portion of the support shaft 14 via a plurality of rollers 16. A cam 20 abuts on the outer peripheral surface of the outer ring 18 to form a rocker arm.

一対の対向側壁１２は例えば鋼材からなり、互いに同形状で平行に対向しており、これら対向側壁１２の長手方向の両側にはそれぞれラッシュアジャスタ受け１２ｂとバルブステム受け１２ｃとが設けられ、一対の対向側壁１２はラッシュアジャスタ受け１２ｂとバルブステム受け１２ｃを介して一体に構成されている。
一対の対向側壁１２にそれぞれ形成される軸端挿通孔１２ａは、それぞれ対向側壁１２を軸方向に同じ一定の孔径で貫通している。
また、支持軸１４は、鋼材からなり、鋼種は特に限定されないが、ＳＵＳ、ＳＵＪ、ＳＫＨなどの鋼材が好ましい。
その支持軸１４は、その軸端部１４ａが一対の対向側壁１２の軸端挿通孔１２ａに挿入され、一対の対向側壁１４間の軸中間部１４ｂには、例えば鋼材からなる転動体としての複数の針状ころ１６を介して外輪１８が回転自在に外装されて支持されている。外輪１８の外周面には、カム２０が当接している。 The pair of opposed side walls 12 are made of, for example, steel, and are opposed in parallel with each other in the same shape. Rush adjuster receivers 12b and valve stem receivers 12c are provided on both sides in the longitudinal direction of the opposed side walls 12, respectively. The opposing side wall 12 is integrally formed through a lash adjuster receiver 12b and a valve stem receiver 12c.
The shaft end insertion holes 12a formed in the pair of opposing side walls 12 respectively penetrate the opposing side walls 12 with the same constant hole diameter in the axial direction.
The support shaft 14 is made of a steel material, and the steel type is not particularly limited, but steel materials such as SUS, SUJ, and SKH are preferable.
The support shaft 14 has a shaft end portion 14a inserted into the shaft end insertion hole 12a of the pair of opposed side walls 12, and a shaft intermediate portion 14b between the pair of opposed side walls 14 having a plurality of rolling elements made of steel, for example. The outer ring 18 is rotatably mounted and supported via the needle rollers 16. A cam 20 is in contact with the outer peripheral surface of the outer ring 18.

次に、本発明の実施の形態１に係るロッカーアーム用軸受の製造方法について説明する。
まず、一対の対向側壁１２間に入り込む長さの支持軸１４と同径で、外輪１８の幅以下のゴム軸に、複数の針状ころ１６を介して外輪１８を回転自在に組み立てた組立体を形成する。
次に、その組立体を一対の対向側壁１２間に介装させ、ゴム軸の両端部を一対の対向側壁１２の軸端挿通孔１２ａに整合させる。
しかる後に、支持軸１４を一方の対向側壁１２の軸端挿通孔１２ａから挿入していき、ゴム軸を他方の対向側壁１２の軸端挿通孔１２ａから次第に飛び出させ、支持軸１４の先端が他方の対向側壁１２の軸端挿通孔１２ａに達したところで、最終的にゴム軸の代わりに支持軸１４が一対の対向側壁１２の軸端挿通孔１２ａに挿着され、その支持軸１４に複数の針状ころ１６を介して外輪１８を回転自在に組み立てることができる。 Next, a method for manufacturing the rocker arm bearing according to Embodiment 1 of the present invention will be described.
First, an assembly in which the outer ring 18 is rotatably assembled via a plurality of needle rollers 16 on a rubber shaft having the same diameter as the support shaft 14 having a length entering between the pair of opposing side walls 12 and less than the width of the outer ring 18. Form.
Next, the assembly is interposed between the pair of opposing side walls 12, and both ends of the rubber shaft are aligned with the shaft end insertion holes 12 a of the pair of opposing side walls 12.
Thereafter, the support shaft 14 is inserted from the shaft end insertion hole 12a of the one opposing side wall 12, the rubber shaft gradually protrudes from the shaft end insertion hole 12a of the other opposite side wall 12, and the tip of the support shaft 14 is the other end. When the shaft end insertion hole 12a of the opposite side wall 12 is reached, the support shaft 14 is finally inserted into the shaft end insertion hole 12a of the pair of opposite side walls 12 instead of the rubber shaft, and a plurality of pieces are attached to the support shaft 14. The outer ring 18 can be rotatably assembled via the needle rollers 16.

かかる支持軸１４の軸端挿通孔１２ａに対する挿着後に、図２に示すように軸端挿通孔１２ａの内周縁に支持軸１４の軸端部の端面をかしめ固定することにより、ロッカーアーム用軸受組立体が組み立てられる。このかしめ部分を符号２４で示す。
このようにして組み立てられたロッカーアーム用軸受組立体の全体に対して例えばアルゴンガスの不活性ガスの雰囲気下で普通焼き入れ、これに続く焼き戻し等の硬化熱処理を行い、製品としてのロッカーアーム用軸受が完成する。
なお、ロッカーアーム用軸受にスケール等が付着している場合は、熱処理後に例えば酸性洗い等の化学的処理を行うことによりとることができる。 After inserting the support shaft 14 into the shaft end insertion hole 12a, the end surface of the shaft end portion of the support shaft 14 is caulked and fixed to the inner peripheral edge of the shaft end insertion hole 12a as shown in FIG. The assembly is assembled. This caulking portion is denoted by reference numeral 24.
The entire rocker arm bearing assembly thus assembled is normally quenched, for example, in an atmosphere of an inert gas of argon gas, followed by a curing heat treatment such as tempering, and the rocker arm as a product. The bearing is completed.
In addition, when the scale etc. have adhered to the bearing for rocker arms, it can take by performing chemical treatments, such as acid washing, after heat processing.

この実施の形態１のように、一対の対向側壁１２の軸端挿通孔１２ａに対する複数の針状ころ１６と外輪１８を備えた支持軸１４の挿着後に、図２に示すように軸端挿通孔１２ａの内周縁に支持軸１４の軸端部１４ａの端面をかしめ固定することにより、ロッカーアーム用軸受組立体が組み立てられ、このようにして組み立てられたロッカーアーム用軸受組立体の全体に対して例えばアルゴンガスの不活性ガスの雰囲気下で普通焼入れの熱処理を行ってロッカーアーム用軸受を完成させるようにしたので、従来のように複雑で手間のかかる高周波焼き入れを行わなくても済み、焼入れ工程を簡素化でき、効率よくロッカーアーム用軸受を組み立てることができる。   As shown in FIG. 2, after inserting the support shaft 14 including the plurality of needle rollers 16 and the outer ring 18 into the shaft end insertion holes 12a of the pair of opposing side walls 12 as in the first embodiment, the shaft end insertion is performed. A rocker arm bearing assembly is assembled by caulking and fixing the end face of the shaft end portion 14a of the support shaft 14 to the inner peripheral edge of the hole 12a, and the rocker arm bearing assembly thus assembled is assembled to the whole. For example, since the bearing for the rocker arm is completed by performing a normal quenching heat treatment in an atmosphere of an inert gas such as an argon gas, it is not necessary to perform a complicated and troublesome high frequency quenching as in the past, The quenching process can be simplified and the rocker arm bearing can be assembled efficiently.

実施の形態２．
図３は本発明の実施の形態２に係るロッカーアーム用軸受の断面図である。
この実施の形態２において、上記実施の形態１と同様の構成は同一符号を付して重複した構成の説明を省略する。
この実施の形態２は、一対の対向側壁１２に対する支持軸１４の取り付け方が実施の形態１と相違するものである。
即ち、上記実施の形態１では、軸端挿通孔１２ａの内周縁に支持軸１４の軸端部１４ａの端面をかしめ固定することにより、ロッカーアーム用軸受組立体が組み立てられているが、この実施の形態２では支持軸１４の一対の対向側壁１２の軸端挿通孔１２ａに対する挿着後に、図３に示すように、軸端挿通孔１２ａの内周縁と支持軸１４の軸端部１４ａの端面外縁とを溶接３４して固定することにより、ロッカーアーム用軸受組立体を組み立て、その後に組み立てられたロッカーアーム用軸受組立体の全体に対して例えばアルゴンガスの不活性ガスの雰囲気下で普通焼入れの熱処理を行い、製品としてのロッカーアーム用軸受を完成させるようにしたものである。
なお、ロッカーアーム用軸受にスケール等が付着している場合は、熱処理後に例えば酸性洗い等の化学的処理を行うことによりとることができる。 Embodiment 2. FIG.
FIG. 3 is a sectional view of a rocker arm bearing according to Embodiment 2 of the present invention.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the overlapping components is omitted.
The second embodiment is different from the first embodiment in how the support shaft 14 is attached to the pair of opposed side walls 12.
That is, in the first embodiment, the rocker arm bearing assembly is assembled by caulking and fixing the end surface of the shaft end portion 14a of the support shaft 14 to the inner peripheral edge of the shaft end insertion hole 12a. In Embodiment 2, after inserting the pair of opposing side walls 12 of the support shaft 14 into the shaft end insertion holes 12a, as shown in FIG. 3, the inner peripheral edge of the shaft end insertion holes 12a and the end surfaces of the shaft end portions 14a of the support shaft 14 A rocker arm bearing assembly is assembled by fixing by welding 34 to the outer edge, and the entire rocker arm bearing assembly assembled thereafter is normally quenched, for example, under an inert gas atmosphere of argon gas. The rocker arm bearing as a product is completed by performing the heat treatment.
In addition, when the scale etc. have adhered to the bearing for rocker arms, it can take by performing chemical treatments, such as acid washing, after heat processing.

この実施の形態２のように、一対の対向側壁１２の軸端挿通孔１２ａに対する複数の針状ころ１６と外輪１８を備えた支持軸１４の挿着後に、図３に示すように、軸端挿通孔１２ａの内周縁と支持軸１４の軸端部１４ａの端面外縁との全周を溶接３４して固定することにより、ロッカーアーム用軸受組立体が組み立てられ、このようにして組み立てられたロッカーアーム用軸受組立体の全体に対して例えばアルゴンガスの不活性ガスの雰囲気下で普通焼入れの熱処理を行ってロッカーアーム用軸受を完成させるようにしたので、従来のように複雑で手間のかかる高周波焼き入れを行わなくても済み、焼き入れ工程を簡素化でき、効率よくロッカーアーム用軸受を組み立てることができる。
また、上記実施の形態では、一対の対向側壁１２と支持軸１４とを溶接３４により固定しているので、かしめによる支持軸１４における変形の発生を考慮しなくて済み、効率よくロッカーアーム用軸受が組み立てることができる。 As shown in FIG. 3, after the insertion of the support shaft 14 including the plurality of needle rollers 16 and the outer ring 18 into the shaft end insertion holes 12a of the pair of opposed side walls 12 as in the second embodiment, The entire periphery of the inner peripheral edge of the insertion hole 12a and the outer peripheral edge of the shaft end portion 14a of the support shaft 14 is fixed by welding 34, thereby assembling the rocker arm bearing assembly. Since the entire arm bearing assembly is subjected to a normal quenching heat treatment in an atmosphere of an inert gas such as an argon gas, the rocker arm bearing is completed. Quenching is not required, the quenching process can be simplified, and the rocker arm bearing can be assembled efficiently.
In the above embodiment, since the pair of opposing side walls 12 and the support shaft 14 are fixed by welding 34, it is not necessary to consider the occurrence of deformation in the support shaft 14 due to caulking, and the bearing for the rocker arm can be efficiently used. Can be assembled.

なお、この実施の形態２では、軸端挿通孔１２ａの内周縁と支持軸１４の軸端部１４ａの端面外縁との全周を溶接３４して固定しているが、充分な接合強度が保たれるのであれば、全周に溶接３４を施さなくてもよい。
上記実施の形態１、２におけるロッカーアーム用軸受組立体に対する硬化熱処理として普通焼入れを示したが、浸炭や浸炭窒化処理等他の硬化熱処理も適用できることはいうまでもない。
また、上記実施の形態１、２のロッカーアーム用軸受はセンタピボットタイプのロッカーアームにも適用することができる。 In the second embodiment, the entire circumference of the inner periphery of the shaft end insertion hole 12a and the outer edge of the end surface of the shaft end portion 14a of the support shaft 14 is fixed by welding 34, but sufficient bonding strength is maintained. If it sag, the weld 34 may not be applied to the entire circumference.
Although normal quenching has been shown as the hardening heat treatment for the rocker arm bearing assemblies in the first and second embodiments, it goes without saying that other hardening heat treatments such as carburizing and carbonitriding can also be applied.
Also, the rocker arm bearings of the first and second embodiments can be applied to a center pivot type rocker arm.

本発明の実施の形態に係るロッカーアーム用軸受が組み込まれているロッカーアームの側面図である。It is a side view of the rocker arm in which the bearing for rocker arms concerning an embodiment of the invention is built. 図１のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG. 本発明の実施の形態２に係るロッカーアーム用軸受の断面図である。It is sectional drawing of the bearing for rocker arms which concerns on Embodiment 2 of this invention.

符号の説明Explanation of symbols

１２ 対向側壁、１２ａ 軸端挿通孔、１４ 支持軸、１４ａ 軸端部、１６ 針状ころ、１８ 外輪、２０ カム、２４ かしめ部。   12 Opposite side wall, 12a Shaft end insertion hole, 14 Support shaft, 14a Shaft end, 16 Needle roller, 18 Outer ring, 20 Cam, 24 Caulking portion.

Claims (3)

一対の対向側壁の軸端挿通孔の内周縁に軸端部が固定される支持軸と、該支持軸の軸中間部の軌道部に、複数の転動体を介して又は直接、回転自在に支持される外輪とを備えたロッカーアーム用軸受の製造方法であって、
前記一対の対向側壁の軸端挿通孔の内周縁に前記支持軸の軸端部を固定手段で固定し、該支持軸の軸中間部の軌道部に、複数の転動体を介して又は直接、外輪を回転自在に支持させて形成したロッカーアーム用軸受組立体の全体に、硬化熱処理を実施してロッカーアーム用軸受を製造することを特徴とするロッカーアーム用軸受の製造方法。 A support shaft whose shaft end portion is fixed to the inner peripheral edge of the shaft end insertion hole of the pair of opposed side walls, and a track portion at the shaft intermediate portion of the support shaft are rotatably supported via a plurality of rolling elements. A method for manufacturing a bearing for a rocker arm comprising an outer ring,
The shaft end portion of the support shaft is fixed to the inner peripheral edge of the shaft end insertion hole of the pair of opposing side walls by a fixing means, and the track portion of the shaft intermediate portion of the support shaft is directly or directly via a plurality of rolling elements. A method for manufacturing a rocker arm bearing, wherein a rocker arm bearing is manufactured by performing a curing heat treatment on the entire rocker arm bearing assembly formed by rotatably supporting an outer ring. 前記固定手段はかしめ又は溶接であることを特徴とする請求項１記載のロッカーアーム用軸受の製造方法。   2. The method for manufacturing a rocker arm bearing according to claim 1, wherein the fixing means is caulking or welding. 前記ロッカーアーム用軸受組立体に対する硬化熱処理は真空又は不活性ガスの雰囲気下で実施される焼入れ熱処理であることを特徴とする請求項１又は２記載のロッカーアーム用軸受の製造方法。   3. The method for manufacturing a rocker arm bearing according to claim 1, wherein the hardening heat treatment for the rocker arm bearing assembly is a quenching heat treatment performed in a vacuum or an inert gas atmosphere.
JP2007044342A 2007-02-23 2007-02-23 Rocker arm bearing manufacturing method Pending JP2008208871A (en)

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EP08003191A EP1961925B1 (en) 2007-02-23 2008-02-21 Manufacturing method of rocker arm and rocker arm roller

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